1 Installing the GC
32 Installation and First Startup
Purge the supply lines for a few minutes before connecting them to the GC flow modules.
Be sure to vent uncombusted hydrogen to a fume hood or other safe location.
When two inlets use the same carrier gas, we recommend using a Tee fitting that includes
shutoff valves for performing leak tests.
When two detectors use the same gases, we recommend using a Tee fitting. Shutoff valves
are not required.
TCD connections The carrier gas and reference gas must come from the same source.
Because of the close spacing of the EPC modules, the simplest way to do this is to attach
lengths of tubing to each input to bring the ends outside the back panel, then join them with a
Tee.
Side mounted detector connections If the GC is equipped with a side-mounted TCD or ECD,
attach the carrier gas to the single gas connection at the back of the side mount enclosure.
(For TCD, an internal Tee feeds the reference gas and input.)
Install Aux EPC module frits for your application
Skip this section if an Aux EPC module is not installed.
The AUX EPC module ships with brown (FID air) restrictors in all channels. For certain
applications, you will have to replace this restrictor (frit) so the EPC module can provide flows
in the correct ranges. See Table 5. Also refer to the other instrument’s or application’s
documentation.
Notes for this table
• Frit G3430-80061 ships in each AUX channel.
• Restrictor kit G3470-60502 is included in the AUX module ship kit.
• Always use new O-rings (part number 5181-3344, O-rings, 6/pk).
• Install tubing and connectors as needed for each additional gas supply required.
Table 5 G3470-60502 Aux EPC restrictor kit
Kit contains Part number Marking Flow Resistance Often used with
O-rings, 6/pk 5181-3344
None G3430-80061 1 ring
Brown
400 ± 30 SCCM air
@ 40 psig
Low FID air, purged splitters, Deans
switch
3 G3430-80062 2 rings
Red
30 ± 1.5 SCCM H2
@ 15 psig
Medium FID hydrogen
3 G3430-80063 3 rings
Blue
3.33 ± 0.3 SCCM H2
@ 15 psig
High NPD hydrogen
3 G3430-20011 None Zero (none) Purged splitter, Deans switch
when using backflush
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